@book { AuenundInnen, title = "Außen und Innen", subtitle = "Räume und ihre Symbolik im Mittelalter", author = "Nikolaus {Staubach} and Vera {Johanterwage}", year = "2007", publisher = "Peter Lang Verlag", address = "Berlin, Germany", url = "https://www.peterlang.com/document/1103206" }